Tein SKM70-AUB00 S.Tech Lowering Spring for Mazda6 Front spring rate: 4.7 kilogram per millimeter (263 pounds per inch) Rear spring rate: 2.9 kilogram per millimeter (168 pounds per inch) Front ride height: -60 millimeter (-2.4 inch) Rear ride height: -44 millimeter (-1.7 inch) Progressive spring rate design